export type ConnectionType = 'single-angle' | 'double-angle' | 'single-plate' | 'tee';
export type SupportType = 'column-flange' | 'column-web' | 'beam-web' | 'hss-column' | 'hss-beam';
export type DesignMethod = 'ASD' | 'LRFD';
export type LoadCombinationOption = 'pre-combined' | 'nominal-loads';
export type ConnectionMethod = 'bolted' | 'welded';

export interface Materials {
    support: {
        fy: number;
        fu: number;
    };
    beam: {
        fy: number;
        fu: number;
    };
    angle: {
        fy: number;
        fu: number;
    };
    modulusOfElasticity: number;
}

export interface Support {
    type: SupportType;
    designation: string;
    similarConnectionOtherSide: boolean;
    // Section properties
    d?: number;  // depth
    tw?: number; // web thickness
    tf?: number; // flange thickness
    bf?: number; // flange width
}

export interface Beam {
    designation: string;
    gapFromSupport: number;
    topFlangeCopeLengthC: boolean;
    topFlangeCopeHeightDc: boolean;
    bottomFlangeCopeLengthC: boolean;
    bottomFlangeCopeHeightDc: boolean;
    // Section properties
    d?: number;  // depth
    tw?: number; // web thickness
    tf?: number; // flange thickness
    bf?: number; // flange width
}

export interface Angle {
    legOnSupport: number;
    legOnBeam: number;
    thickness: number;
    connectionMethod: ConnectionMethod;
    edgeDistanceHorizontal: number;
    edgeDistanceVertical: number;
    eccentricityToBeamCL: number;
}

export interface Bolts {
    numberOfRows: number;
    diameter: number; // in inches: 0.75, 0.875, 1.0
    grade: 'A325' | 'A490';
    spacing: number;
    threadsIncluded: boolean;
}

export interface Weld {
    type: string;
    size: number;
    strength: number;
}

export interface Loads {
    dead: number;
    live: number;
    rLive: number;
    snow: number;
    wind: number;
    seismic: number;
}

export interface LoadCombination {
    id: number;
    equation: string;
    pu: number;
    passes: boolean;
}

export interface LimitState {
    name: string;
    phi: number; // resistance factor for LRFD
    omega: number; // safety factor for ASD
    rn: number; // nominal strength
    phiRn: number; // design strength LRFD
    rnOmega: number; // allowable strength ASD
    applicable: boolean;
}

export interface GeometryCheck {
    description: string;
    lengthC?: number | string;
    heightDc?: number | string;
    status: 'OK' | 'NG';
}

export interface DesignCheck {
    connectionStrengthRatio: number;
    designCheckRatio: number;
    geometricConstraintsCheck: 'OK' | 'NG';
}

export interface ConnectionState {
    connectionType: ConnectionType;
    support: Support;
    beam: Beam;
    angle: Angle;
    bolts: Bolts;
    weld: Weld;
    materials: Materials;
    loads: Loads;
    designMethod: DesignMethod;
    loadCombinationOption: LoadCombinationOption;

    // Calculated results
    loadCombinations: LoadCombination[];
    limitStates: LimitState[];
    geometryChecks: GeometryCheck[];
    designCheck: DesignCheck;

    // Actions
    setConnectionType: (type: ConnectionType) => void;
    setSupport: (support: Partial<Support>) => void;
    setBeam: (beam: Partial<Beam>) => void;
    setAngle: (angle: Partial<Angle>) => void;
    setBolts: (bolts: Partial<Bolts>) => void;
    setWeld: (weld: Partial<Weld>) => void;
    setMaterials: (materials: Partial<Materials>) => void;
    setLoads: (loads: Partial<Loads>) => void;
    setDesignMethod: (method: DesignMethod) => void;
    setLoadCombinationOption: (option: LoadCombinationOption) => void;
    calculate: () => void;
}